1274 FLAG_SET_DEFAULT(UsePopCountInstruction, false);
1275 }
1276
1277 // Use fast-string operations if available.
1278 if (supports_erms()) {
1279 if (FLAG_IS_DEFAULT(UseFastStosb)) {
1280 UseFastStosb = true;
1281 }
1282 } else if (UseFastStosb) {
1283 warning("fast-string operations are not available on this CPU");
1284 FLAG_SET_DEFAULT(UseFastStosb, false);
1285 }
1286
1287 #ifdef COMPILER2
1288 if (FLAG_IS_DEFAULT(AlignVector)) {
1289 // Modern processors allow misaligned memory operations for vectors.
1290 AlignVector = !UseUnalignedLoadStores;
1291 }
1292 #endif // COMPILER2
1293
1294 if( AllocatePrefetchInstr == 3 && !supports_3dnow_prefetch() ) AllocatePrefetchInstr=0;
1295 if( !supports_sse() && supports_3dnow_prefetch() ) AllocatePrefetchInstr = 3;
1296
1297 // Allocation prefetch settings
1298 intx cache_line_size = prefetch_data_size();
1299 if( cache_line_size > AllocatePrefetchStepSize )
1300 AllocatePrefetchStepSize = cache_line_size;
1301
1302 AllocatePrefetchDistance = allocate_prefetch_distance();
1303 AllocatePrefetchStyle = allocate_prefetch_style();
1304
1305 if (is_intel() && cpu_family() == 6 && supports_sse3()) {
1306 if (AllocatePrefetchStyle == 2) { // watermark prefetching on Core
1307 #ifdef _LP64
1308 AllocatePrefetchDistance = 384;
1309 #else
1310 AllocatePrefetchDistance = 320;
1311 #endif
1312 }
1313 if (supports_sse4_2() && supports_ht()) { // Nehalem based cpus
1314 AllocatePrefetchDistance = 192;
1315 if (FLAG_IS_DEFAULT(AllocatePrefetchLines)) {
1316 FLAG_SET_DEFAULT(AllocatePrefetchLines, 4);
1317 }
1318 }
1319 #ifdef COMPILER2
1320 if (supports_sse4_2()) {
1321 if (FLAG_IS_DEFAULT(UseFPUForSpilling)) {
1322 FLAG_SET_DEFAULT(UseFPUForSpilling, true);
1323 }
1324 }
1325 #endif
1326 }
1327
1328 #ifdef _LP64
1329 // Prefetch settings
1330 PrefetchCopyIntervalInBytes = prefetch_copy_interval_in_bytes();
1331 PrefetchScanIntervalInBytes = prefetch_scan_interval_in_bytes();
1332 PrefetchFieldsAhead = prefetch_fields_ahead();
1333 #endif
1334
|
1274 FLAG_SET_DEFAULT(UsePopCountInstruction, false);
1275 }
1276
1277 // Use fast-string operations if available.
1278 if (supports_erms()) {
1279 if (FLAG_IS_DEFAULT(UseFastStosb)) {
1280 UseFastStosb = true;
1281 }
1282 } else if (UseFastStosb) {
1283 warning("fast-string operations are not available on this CPU");
1284 FLAG_SET_DEFAULT(UseFastStosb, false);
1285 }
1286
1287 #ifdef COMPILER2
1288 if (FLAG_IS_DEFAULT(AlignVector)) {
1289 // Modern processors allow misaligned memory operations for vectors.
1290 AlignVector = !UseUnalignedLoadStores;
1291 }
1292 #endif // COMPILER2
1293
1294 if (FLAG_IS_DEFAULT(AllocatePrefetchInstr)) {
1295 if (AllocatePrefetchInstr == 3 && !supports_3dnow_prefetch()) {
1296 FLAG_SET_DEFAULT(AllocatePrefetchInstr, 0);
1297 } else if (!supports_sse() && supports_3dnow_prefetch()) {
1298 FLAG_SET_DEFAULT(AllocatePrefetchInstr, 3);
1299 }
1300 }
1301
1302 // Allocation prefetch settings
1303 intx cache_line_size = prefetch_data_size();
1304 if (FLAG_IS_DEFAULT(AllocatePrefetchDistance) &&
1305 (cache_line_size > AllocatePrefetchStepSize)) {
1306 FLAG_SET_DEFAULT(AllocatePrefetchStepSize, cache_line_size);
1307 }
1308
1309 AllocatePrefetchDistance = allocate_prefetch_distance();
1310 AllocatePrefetchStyle = allocate_prefetch_style();
1311
1312 if (is_intel() && cpu_family() == 6 && supports_sse3()) {
1313 if (FLAG_IS_DEFAULT(AllocatePrefetchDistance) &&
1314 (AllocatePrefetchStyle == 2)) { // watermark prefetching on Core
1315 #ifdef _LP64
1316 FLAG_SET_DEFAULT(AllocatePrefetchDistance, 384);
1317 #else
1318 FLAG_SET_DEFAULT(AllocatePrefetchDistance, 320);
1319 #endif
1320 }
1321 if (supports_sse4_2() && supports_ht()) { // Nehalem based cpus
1322 if (FLAG_IS_DEFAULT(AllocatePrefetchDistance)) {
1323 FLAG_SET_DEFAULT(AllocatePrefetchDistance, 192);
1324 }
1325 if (FLAG_IS_DEFAULT(AllocatePrefetchLines)) {
1326 FLAG_SET_DEFAULT(AllocatePrefetchLines, 4);
1327 }
1328 }
1329 #ifdef COMPILER2
1330 if (supports_sse4_2()) {
1331 if (FLAG_IS_DEFAULT(UseFPUForSpilling)) {
1332 FLAG_SET_DEFAULT(UseFPUForSpilling, true);
1333 }
1334 }
1335 #endif
1336 }
1337
1338 #ifdef _LP64
1339 // Prefetch settings
1340 PrefetchCopyIntervalInBytes = prefetch_copy_interval_in_bytes();
1341 PrefetchScanIntervalInBytes = prefetch_scan_interval_in_bytes();
1342 PrefetchFieldsAhead = prefetch_fields_ahead();
1343 #endif
1344
|